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Biomass gasification is a promising technology for producing a fuel gas which is useful for power generation systems. In biomass gasification processes, tar formation often causes some problems such as pipeline plugging. Thus, proper tar treatment is necessary. So far, nickel (Ni)-based catalysts have been intensively studied for the catalytic tar removal. However, the deactivation of Ni-based catalysts takes place because of coke deposition and sintering of Ni metal particles. To overcome these problems, we have been using ruthenium (Ru)-based catalyst for tar removal. It is reported by Okada et al., that a Ru/Al2O3 catalyst is very effective for preventing the carbon deposition during the steam reforming of hydrocarbons(1-3). Also, this catalyst is more active than the Ni-based catalyst at a low steam to carbon ratio (S/C) (4). Benzene was used for the tar model compound because it is the main constituent of biomass tar (5) and also because it represents a stable aromatic structure apparent in tar formed in biomass gasification processes. The steam reforming process transforms hydrocarbons into gaseous mixtures constituted of carbon dioxide (co₂), carbon monoxide (CO), methane (CH4) and hydrogen (H2).

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